| Acronym | Meaning |
| RAPW | Relativistic Augmented Plane Wave |
| IDLH | Immediately Dangerous To Life Or Health |
| RP/M | Reinforced Plastics/mortar |
| ENA | Energetic Neutral Atoms (astronomical Plasmas) |
| PLY | Photoluminescence Yield |
| CSML | Chemical Structure Markup Language |
| ENR | Epoxidized Natural Rubber |
| ASTER | Assessment Tools For The Evaluation Of Risk |
| CAD | Computer-Aided Design |
| NTDB | National Trade Databank |